/**
  * @RDE_HEADER@
  * Class Geometry
  * $Id$
  * $HeadURL$
  * $Author$
  */

// Own
#include "geometry.h"
#include <cmath>

//----------------------------------------------------------------------------
namespace SituationMap
{


QList<QPointF> Geometry::createCircle(const QPointF &center, qreal radius, int steps)
{
  QList<QPointF> circle;
  circle.reserve(steps);

  if (steps < 10)
    steps = 10;
  for (int i = 0; i < 360; i += (360 / steps))
  {
    double winkel = i * M_PI / 180.0;
    circle << (center + QPointF(cos(winkel) * radius, sin(winkel) * radius));
  }
  circle << circle.value(0); // 'close' the circle
  //  circle.translate(center);
  return circle;
}


QList<QPointF> Geometry::createArcSegment(const QPointF &center, qreal radius,
                                          double startAngle_degree,
                                          double angleOffset_clockwise_degree,
                                          int stepsPer360)
{
  QList<QPointF> points;

  if (stepsPer360 < 10)
    stepsPer360 = 10;

  startAngle_degree *= -1.0;
  startAngle_degree += 90;

  // normalize
  startAngle_degree            = fmod(startAngle_degree, 360);
  angleOffset_clockwise_degree = fmod(angleOffset_clockwise_degree, 360);

  // steps
  int steps = fabs(angleOffset_clockwise_degree) * stepsPer360 / 360;
  points.reserve(steps + 1);

  double startAngle_rad        = startAngle_degree            * M_PI / 180.0;
  double angleOffset_right_rad = angleOffset_clockwise_degree * M_PI / 180.0;
  for (int i = 0; i < steps; ++i)
  {
    //                                 '-' to go clockwise:
    double winkel_rad = (startAngle_rad - (i * angleOffset_right_rad / steps));
    points << (center + QPointF(cos(winkel_rad) * radius, sin(winkel_rad) * radius));
  }
  // calculate very last iteration (independent from 'steps'):
  double winkel_rad = (startAngle_rad - (angleOffset_right_rad));
  points << (center + QPointF(cos(winkel_rad) * radius, sin(winkel_rad) * radius));

  return points;
}



} // namespace SituationMap